Arango C P (3 results)

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  • Seller: ConchBooks, Harxheim, GermanyConchBooks

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    Early authors regarded Pycnogonida (sea spiders) either as aquatic arachnids, 'degraded' crustaceans or as some sort of intermediate form between the two. Subsequently, pycnogonids were either placed among the Chelicerata or considered as an isolated group, unrelated to other arthropods. The latter model is untenable under phylogenetic systematics and recent cladistic studies have supported one of two alternative hypotheses. The first is the traditional Chelicerata s.lat. concept, i.e. (Pycnogonida?+?Euchelicerata). This, however, has only one really convincing synapomorphy: chelate chelicerae. The second hypothesis recognizes (Pycnogonida?+?all other Euarthropoda) and has been recovered in various 'total evidence' studies. Morphologically some characters the presence of gonopores on the trunk and absence of a labrum, nephridia and intersegmental tendons support Cormogonida (Euarthropoda excluding pycnogonids). Advances in developmental biology have proposed clear interpretations of segmentation homologies. However, so far there is also a confrontation of the two hypotheses depending on whether the last walking leg segment is considered part of the prosoma. In this case pycnogonids have too many prosomal segments compared with Euchelicerata; perhaps implying they are not sister groups. Alternatively, if part of the postprosomal region, the last leg pair could correspond to the chilarial segment in euchelicerates and its uniramous state could be apomorphic with respect to other euarthropods. Molecular phylogenies need to be more rigorously analysed, better supported by data from different sources and technique-sensitive aspects need to be explored. Chelicerata s.lat. may emerge as the more convincing model, yet even the putative autapomorphy of chelicerae needs to be treated with caution as there are fossil 'great appendage' arthropods in the early Palaeozoic which also have a robust, food-gathering, pair of head limbs and which may lie on the chelicerate, or even the euarthropod, stem lineage. 14 pp., 6 figs, 4.…

  • Language: Spanish

    Published by Ars Médica, 2009

    849751257X / 9788497512572

    • Softcover

    Seller: Vuestros Libros, Oviedo, O, SpainVuestros Libros

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    Condition: Nuevo. El resultado positivo de las monografías anteriores, y sobre todo la opinión y el uso que por parte de los clínicos se ha dado a este tipo de materiales educativos, han animado a proponer esta segunda edición de la enfermedad que más debate y cuerpo ha dado a la psiquiatría, la esquizofrenia. En esta segunda edición se ha actualizado el estado del conocimiento, con una selección de aspectos y características conceptuales, clínicas y terapéuticas de impacto. Destacamos el capítulo sobre la prevención y la intervención en casos de tolerabilidad de los tratamientos y el manejo del nivel de salud general de los pacientes afectos de esquizofrenia. Incluye CD-ROM que convierte esta obra en una herramienta única que facilita al especialista la trasmisión del conocimiento, con la posibilidad de modificar y personalizar, si así lo desea, los diferentes esquemas para distintos formatos de presentación (sesiones clínicas, de divulgación y socialización del conocimiento, debates). Esta obra ofrece un fácil acceso a la información actualizada, de forma sintética y comprensiva, de tal modo que resulte de utilidad y de consulta rápida, tanto al clínico como a docentes. Índice de Capítulos 1 Concepto 2 Epidemiología 3 Factores etiológicos y/o de riesgo 4 Criterios diagnósticos 5 Formas prodrómicas y de inicio 6 Manifestaciones clínicas 7 Evaluación 8 Estado de salud general en pacientes esquizofrénicos. Sobremorbilidad y sobremortalidad 9 Evolución y pronóstico 10 Terapéuticas biológicas y psicológicas 11 Prevención de recaídas y comportamientos suicidas 12 Impacto de la enfermedad 13 Aspectos médico-legales.…

  • Language: English

    Published by American Museum of Natural History, 2006

    0913424587 / 9780913424582

    • Softcover

    Seller: ralfs-buecherkiste, Herzfelde, MOL, Germanyralfs-buecherkiste

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    Paperback. Condition: Gut. 365 Seiten Sehr guter Zustand/ very good With ill. ha1040543 Sprache: Englisch Gewicht in Gramm: 800.